C#实现调用迅雷下载的方法

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Runtime.InteropServices;using System.Threading;namespace ThunderSDK{ class Program { enum enumTaskStatus {  enumTaskStatus_Connect = 0,         // 已经建立连接  enumTaskStatus_Download = 2,        // 开始下载   enumTaskStatus_Pause = 10,         // 暂停  enumTaskStatus_Success = 11,        // 成功下载  enumTaskStatus_Fail = 12,          // 下载失败 }; public const int XL_SUCCESS = 0; public const int XL_ERROR_FAIL = 0x10000000; // 尚未进行初始化 public const int XL_ERROR_UNINITAILIZE = XL_ERROR_FAIL + 1; // 不支持的协议，目前只支持HTTP public const int XL_ERROR_UNSPORTED_PROTOCOL = XL_ERROR_FAIL + 2; // 初始化托盘图标失败 public const int XL_ERROR_INIT_TASK_TRAY_ICON_FAIL = XL_ERROR_FAIL + 3; // 添加托盘图标失败 public const int XL_ERROR_ADD_TASK_TRAY_ICON_FAIL = XL_ERROR_FAIL + 4; // 指针为空 public const int XL_ERROR_POINTER_IS_NULL = XL_ERROR_FAIL + 5; // 字符串是空串 public const int XL_ERROR_STRING_IS_EMPTY = XL_ERROR_FAIL + 6; // 传入的路径没有包含文件名 public const int XL_ERROR_PATH_DONT_INCLUDE_FILENAME = XL_ERROR_FAIL + 7; // 创建目录失败 public const int XL_ERROR_CREATE_DIRECTORY_FAIL = XL_ERROR_FAIL + 8; // 内存不足 public const int XL_ERROR_MEMORY_ISNT_ENOUGH = XL_ERROR_FAIL + 9; // 参数不合法 public const int XL_ERROR_INVALID_ARG = XL_ERROR_FAIL + 10; // 任务不存在 public const int XL_ERROR_TASK_DONT_EXIST = XL_ERROR_FAIL + 11; // 文件名不合法 public const int XL_ERROR_FILE_NAME_INVALID = XL_ERROR_FAIL + 12; // 没有实现 public const int XL_ERROR_NOTIMPL = XL_ERROR_FAIL + 13; // 已经创建的任务数达到最大任务数，无法继续创建任务 public const int XL_ERROR_TASKNUM_EXCEED_MAXNUM = XL_ERROR_FAIL + 14; // 任务类型未知 public const int XL_ERROR_INVALID_TASK_TYPE = XL_ERROR_FAIL + 15; // 文件已经存在 public const int XL_ERROR_FILE_ALREADY_EXIST = XL_ERROR_FAIL + 16; // 文件不存在 public const int XL_ERROR_FILE_DONT_EXIST = XL_ERROR_FAIL + 17; // 读取cfg文件失败 public const int XL_ERROR_READ_CFG_FILE_FAIL = XL_ERROR_FAIL + 18; // 写入cfg文件失败 public const int XL_ERROR_WRITE_CFG_FILE_FAIL = XL_ERROR_FAIL + 19; // 无法继续任务，可能是不支持断点续传，也有可能是任务已经失败 // 通过查询任务状态，确定错误原因。 public const int XL_ERROR_CANNOT_CONTINUE_TASK = XL_ERROR_FAIL + 20; // 无法暂停任务，可能是不支持断点续传，也有可能是任务已经失败 // 通过查询任务状态，确定错误原因。 public const int XL_ERROR_CANNOT_PAUSE_TASK = XL_ERROR_FAIL + 21; // 缓冲区太小 public const int XL_ERROR_BUFFER_TOO_SMALL = XL_ERROR_FAIL + 22; // 调用XLInitDownloadEngine的线程，在调用XLUninitDownloadEngine之前已经结束。 // 初始化下载引擎线程，在调用XLUninitDownloadEngine之前，必须保持执行状态。 public const int XL_ERROR_INIT_THREAD_EXIT_TOO_EARLY = XL_ERROR_FAIL + 23; [DllImport("XLDownload.dll", EntryPoint = "XLInitDownloadEngine")] public static extern bool XLInitDownloadEngine(); [DllImport("XLDownload.dll", EntryPoint = "XLURLDownloadToFile", CharSet = CharSet.Unicode)] public static extern int XLURLDownloadToFile(string pszFileName, string pszUrl, string pszRefUrl, ref Int32 lTaskId); [DllImport("XLDownload.dll")] public static extern int XLQueryTaskInfo(int lTaskId, ref int plStatus, ref double pullFileSize, ref double pullRecvSize); [DllImport("XLDownload.dll")] public static extern int XLPauseTask(int lTaskId, ref int lNewTaskId); [DllImport("XLDownload.dll")] public static extern int XLContinueTask(int lTaskId); [DllImport("XLDownload.dll")] public static extern int XLContinueTaskFromTdFile(string pszTdFileFullPath, ref int lTaskId); [DllImport("XLDownload.dll")] public static extern void XLStopTask(int lTaskId); [DllImport("XLDownload.dll")] public static extern bool XLUninitDownloadEngine(); [DllImport("XLDownload.dll")] public static extern int XLGetErrorMsg(int dwErrorId, string pszBuffer, ref int dwSize); static void Main(string[] args) {  if (!XLInitDownloadEngine())  {  Console.WriteLine("下载引擎初始化错误");  return;  }  Int32 lTaskId = 0;  string filename = "d://xx.exe";  string url = "http://xmp.down.sandai.net/kankan/XMPSetup_3.8.1.485-www.exe";  string refurl = "http://xmp.down.sandai.net";  int dwRet = XLURLDownloadToFile(filename, url, refurl, ref lTaskId);  if (XL_SUCCESS != dwRet)  {  XLUninitDownloadEngine();  Console.WriteLine("添加新任务失败");  return;  }  Console.WriteLine("开始下载");  do  {  Thread.Sleep(1000);  double pullFileSize = 0;  double pullRecvSize = 0;  int lStatus = -1;  dwRet = XLQueryTaskInfo(lTaskId, ref lStatus, ref pullFileSize, ref pullRecvSize);  if (XL_SUCCESS == dwRet)  {   if ((int)enumTaskStatus.enumTaskStatus_Success == lStatus)   {   Console.WriteLine("下载完成");   break;   }   if (0 != pullFileSize)   {   double douProcess = (double)pullRecvSize / (double)pullFileSize;   douProcess *= 100.0;   Console.WriteLine("下载进度：{0}%", douProcess);   }   else   {   Console.WriteLine("文件长度为0");   }  }  } while (XL_SUCCESS == dwRet);  XLStopTask(lTaskId);  XLUninitDownloadEngine(); } }}